Abstract: A phased array antenna may include an antenna substrate, an array of antenna elements carried by the antenna substrate, and time delay units (TDUs) coupled to the array of antenna element. Each time delay unit may include a circuit substrate, and delay circuits carried by the circuit substrate and coupled in series. Each delay circuit may have a respective signal delay value. At least one external bypass connection is carried by the circuit substrate and is coupled to the delay circuits to configure an overall time delay of the time delay unit.

Abstract: An antenna may include an antenna main reflector having a shape defining a focal area, and a dual-function antenna structure at the focal area defining a first antenna feed at a first frequency and an antenna subreflector at a second frequency. The dual-function antenna structure may include a substrate and an array of antenna elements carried thereby. A second antenna feed is adjacent the antenna main reflector and operable at the second frequency to cooperate with the antenna subreflector and antenna main reflector.

Abstract: A system to be carried by a vehicle may include a dual-function antenna structure that includes a substrate and an array of antenna elements carried thereby. A beam forming network may be coupled to the dual-function antenna structure. A radar detector to be carried by the vehicle may be configured to detect radar signals directed to the vehicle. A controller may be configured to control the dual-function antenna structure to switch between a steerable phased array communication mode and a low radar cross section (RCS) mode responsive to the radar detector.

Abstract: An antenna may include an antenna main reflector having a shape defining a focal area, and a dual-function antenna structure at the focal area defining a first antenna feed at a first frequency and an antenna subreflector at a second frequency. The dual-function antenna structure may include a substrate and an array of antenna elements carried thereby. A second antenna feed is adjacent the antenna main reflector and operable at the second frequency to cooperate with the antenna subreflector and antenna main reflector.

Abstract: A phased array antenna may include an antenna substrate, an array of antenna elements carried by the antenna substrate, and time delay units (TDUs) coupled to the array of antenna element. Each time delay unit may include a circuit substrate, and delay circuits carried by the circuit substrate and coupled in series. Each delay circuit may have a respective signal delay value. At least one external bypass connection is carried by the circuit substrate and is coupled to the delay circuits to configure an overall time delay of the time delay unit.

Abstract: A phased array antenna may include an antenna substrate, an array of antenna elements carried by the antenna substrate, and time delay units (TDUs) coupled to the array of antenna elements. Each time delay unit may include a circuit substrate, and delay circuits carried by the circuit substrate and coupled in series. Each delay circuit has a controllable respective signal delay value. At least one first delay circuit of the delay circuits may include a bypassable delay circuit having a bypassable signal loss, and at least one second delay circuit of the delay circuits may include a non-bypassable delay circuit having a non-bypassable signal loss.

Abstract: Balun with tunable bandpass filter characteristic includes first, second and third coupling elements disposed on a substrate. The first and second coupling elements are arranged on the substrate relative to the third coupling element to couple two identical but out of phase signals to form a corresponding unbalanced signal in the third coupling element. A plurality of tunable resonator elements are distributed within an area of the substrate defined on one side by the first and second coupling elements and on an opposing side by the third coupling element. The tunable resonator elements are configured to selectively produce a bandpass filter response.

Abstract: Balun with tunable bandpass filter characteristic includes first, second and third coupling elements disposed on a substrate. The first and second coupling elements are arranged on the substrate relative to the third coupling element to couple two identical but out of phase signals to form a corresponding unbalanced signal in the third coupling element. A plurality of tunable resonator elements are distributed within an area of the substrate defined on one side by the first and second coupling elements and on an opposing side by the third coupling element. The tunable resonator elements are configured to selectively produce a bandpass filter response.